Method of and apparatus for making multiply paper



Augrll, 1931. M. H. KLIEFOTH 1,818,716

METHOD OF AND APPARATUS FOR MAKING MULTIPLY PAPER Filed Aug. 16, 1950, 2 sheets-$11581 1 Z-| I F 9 1 T I v 2 ATTORNEY-5 1 M.- H. KLIEFOTH 1,818,716

METHOD OF AND APPARATUS FOR MAKING MULTIPLY PAPER Filed Aug. 16, 1930 2 Sheets-Sheet 2 INVENTOR ATTORNEYS Patented Aug. 11, 1931 UNITED STATES PATENT OFFICE.

HAX H. KLIEFOTH, OF. MADISON, WISCONSIN, ASSIGNOR TO F. BURGESS LABORA- TORIES, ING, OF MADISON, WISCONSIN, A CORPORATION OF DELAWARE METHOD OF AND APPARATUS FOR MAKING MULTIPLY PAPER Application filed August 16, 1939. Serial No. 475,697.

My invention relates to the manufacture of fibrous sheets made by laying down a succession of .overlapping folds of moist pulp web as disclosed in Patents Nos. 1,737,282 .and

1,737,283 to Howard F. Weiss and Patent patents.

N 0. 1,737,285 to Max H. Kliefoth, all issued November 26, 1929. The present invention consists of an improvement in the machine and method disclosed in the above mentioned It is the general object of the invention to provide a fibrous sheet of the characterdescribed having greater uniformity of density and greater regularity of side edges whereby trimming wastage is reduced.

It is the specific object of this invention to provide a method and means for smoothing and flattening the looped edges of the folds of moist pulp web before they are conducted to the pressing and drying apparatus.

It is a further object of the invention to provide for the smoothing of the fold edges without the introduction of any additional separate operations upon the web.

Other objects and advantages will become apparent from the following description which is to be taken in conjunction with the accompanying drawings wherein:

Fig. 1 is a diagrammatic plan view of the improvedapparatus used to make the fibrous sheet 2 is a partial, vertical, sectional view on line 2+2 of Fig. 1; Fig. 3 is a partial side view, in detail, showing the smoothing device and that portion of the machine at which the moist pulp web is transferred to a moving conveyor, parts being shown in section;

Fig. 4 is a partial end view showing'the smoothing device in detail, parts being shown in section; I

Fig. 5 is a plan view of a portion of a sheet produced by the machine without the smoothing device; 1

Fig. 6 is a plan View of a portion of a sheet with a smoothing device; and

Fig. 7 is a transverse sectional view of a thick sheet which is being built up without the use of any smoothing and flattening device.

The invention can best be understood-by re'ferrin to the accompanying drawings in which 11 e numerals indicate like parts in the several figures.

The vat 1 of a wet machine contains the slurry of water and pulp. The usual perforate cylinder mould 2 picksup a web of pulp which is then carried to couch roll 3 around which felt 4 travels in the indicated direction. The wet pulp web is picked up and carried along on felt 4 and is then pressed by press roll 5. The moist pulp .web is picked up by press roll 5 and is removed therefrom by doctor 6. The pulp web may be creped by the doctor or may be kept smooth, as desired. The pulp web 8 is'then carried forward by conveyor belt 7 which is a part of a hinged reciprocating looping device. The ofi-take roll 9 (see Fig. 3) of the hinged looping device reciprocatesalong guide bars 10 and distributes the pul web 8 transversely upon conveyor 11. It is o vious that the conveyor may also move parallel to the direction of travel of the pulp web, although in the latter case the advantages derived, from my invention are not so great. f

Tightener roll 12 functions to keep conveyor belt 7 taut and directs the return travel of belt 7 along a path which is at all times as nearly as possible of the same length as. the forward path. The pulp web is de posited transversely upon the conveyor 11 in a succession of overlapping folds, adjacent folds being spaced from each other in the direction in which conveyor 11 travels.

To avoid confusion in the use of terms, it

is pointed out that throughout the specification and claims the terms folds is used to define, not only the folded edge, but the entire overlapping portions formed by each reciprocation of the looping device; and they 11'the succession of overlapping folds usually resistant material may be dusted or sprayed on the pulp web from a suitable device as 8 in Fig. 2.

In the formation of a single fold, conveyor belt 7 may be considered as laying downa rectangle of moist pulp web. The movement of conveyor 11, however, distorts the shape of the rectangle into that of a rhomboid. As a result, a twist is given the web at the folded edge with the result that a wrinkled and irregular folded-edge is formed, which may or may not fall in line with the edges of the rest of the folds. In the formation of thick fibrous sheets, the movement of conveyor 11 is sufficiently slow to reduce somewhat the v twisting efl'ect and the attendant wrinkles and irregularity of edges, but a new difficulty arises. As illustrated in exaggerated fashion in Fig. 7, the loops 35 are more or less rounded causing the material to pile up higher at the edges of the sheet than it does at the intermediate portions. As the relative height of the edge portions increases they become more and more inclined from the horizontal. Since the same length of web is deposited for each successive fold the successive loops approach the mid-portion of the sheet and the folds become shorter if measured horizontally from end to end. The incline of the edge portions finally becomes great enough that the web slumps toward the bottom of the incline as indicated at 36, with the result that the material becomes non-uniformly distributed throughout the width of the sheet. The pressing apparatus to which the sheet is subsequently subjected compresses the material along vertical lines just as it finds it with the result that the compressed sheet is of non-uniform density an its edges are irregular, requiring considerable side trimming.

I have found that by the use of a smoothing device, such as that to be hereinafter described, laminated sheets or boards of-uniform density may be produced in thicknesses up to one inch and greater.

Referring to Figs. 3 and 4, guides 19 are mounted on guide, bars 10 and are reciprocated' by means of a suitable source of power,

' such as a cam and cam follower (not shown).

Roller 9 is provided with a shaft 9. mounted in journals 20 carried by guides 19 whereby the end of the reciprocating-looping device point at its brackets 21 are mounted in a fixed position upon reciprocating guides 19 by suitable means, as bolts 22. Z-shaped actuating members or levers 23 are mounted pivotally on brackets 21 by means of pins 24. In similar manner levers 25 are mounted below levers 23 upon brackets 21 by means of pins 26. The lower ends of levers 25 are fastened rigidly to and from a part of frame 27-. Rolls 28 and 28a are rotatably mounted at the ends of frame 27. Pins 29 are mounted rigidly upon the lower ends of levers 23 to cooperate with slots 30 in the upper ends of levers 25. Springs 31 are fastened at their respective ends to levers 23 and frame 27 to aid in returning frame 27 into the inoperative position and to prevent its too free and unreduring its return motion. The rounded loop is clearly shown at 34 while the previously laid folds have been smoothed down. In the position shown, the looping mechanism with the attached smoothing device is in a position to begin its forward motion to the left as shown by the arrow. Withthe starting of such forward movement an additional loop is formed at 33 and an additional fold is started across conveyor 11.

As the loo ing device reaches the central orward travel, Z-shaped levers 23 engage trip-blocks 32. Further forward movement of reciprocating guides 19 causes levers'23 to rotate in a clockwise direction about pins 24. Cooperation between pins 29 on levers 23 and slots 30 in levers 25 cause the latter, together with the attached frame 27, to rotate in a counter-clockwise direction about pins 26. The-tilting of frame 27 with d the attached rolls 28 and 28a causes roll 28 to contact with fold 34 and upon further forward movement of the reciprocatin looping device, roll 28 smooths the folde edge at 34 and reduces the rounded edge toa fiat edge. Further forward movement of guides 19 causes levers 2 3 to pass beyond trip-blocks 32 and allow frame 27 to return to the 'horizontal or ino erative position and levers 23 and 25 to their vertical position as shown in Fig. 3. j

As the looping device reaches the forward point of its travel and begins its return movement another loop is formed at 34 and another fold is started across conveyor 11."

As the looping device reaches the central point of its travel, levers 23 again engage trip-blocks 32. Further travel of the looping device causes levers 23 to rotate in a counter-clockwise direction about pins 24. Cooperation between pins 29 on levers 23 and slots in-levers 25 causes the latter, together .with attached frame 27, to rotate in a clockwise direction aboutpins 26. The tilting of frame 27 with attached rolls 28 and 28a'causes roll 28a to contact with the pulp web and on further movement of the looping device, roll 28a smooths down the folded edge at 33. Further movement of guides 19 cause levers 23 to pass beyond trip-blocks 32- and allow frame 27 to returnto its inoperative-position .as heretoforedescribed. The looping device material and all of the looped edges are substantially in line.

If desired the smoothing rolls may be actuated so as to smooth the entire fold. In this case smoothing roll 28 would be actuated so as to begin its contact with the fold at the center of the fold durin of the ofi-take roll. gmoothing roll 28a would likewise begin its contact with the fold at the center of the fold during the return travel of the off-take roll.-

The drawings and description of the smoothing mechanism are specific for the purpose of illustration, but it is evident to a' person skilled in the art that the details may be altered without departing from the spiritof the invention.

I claim:

1. In a machine of the class described, a reciprocating looping device for laying down a succession of overglapping folds of moist pulp web, reciprocating guides for said looping device, stationary guide supports for said guides, an edge-smoothing device for said folds, said edge-smoothing device comprising in combination, brackets depending from said guides, a frame supported pivotally upon said brackets, smoothing rolls mounted in the respective ends of said frame, actuating levers pivotally mounted upon said brackets, trip-blocks mounted upon said guide supports, said levers and said tripblocks being adapted to cooperate with each other and with said frame to move a smoothing roll into contact with opposite looped edge portions of said folds with each successive reciprocating movement of said looping device, and coil springs fastened between said the forward travel,

actuating levers and the end portions of said frame to move said smoothing rolls into the inoperative position, said smoothing contact being made while said roll is moving outwardly with respect to. the fold.

2. In a machine of the'class described, in combination, a reciprocating off-take roll, reciprocating guides for said off-take roll, a bracket depending from each of said guides, a frame pivotally supported between said brackets, a cylindrical roll rotatably sup ported at each end of said frame, a lever pivotally mounted upon each of said brackets in engagement at one end with said frame, horizontal guide bars for said, guides, tripblocks mounted upon said guide bars adapted to engage said levers at their opposite ends during reciprocation of said off-take roll, and springs attached between the lower ends of said levers and portions of said frame intermediate its points of support and its ends. 3. In a .machine of the class described, in combination with a reciprocating off-take roll, reciprocating guides for said off-takeroll, guide supports for said guides, a frame pivotally suspended from said guides, cylindrical rolls rotatably mounted transversely upon the respective ends of said frame, and means comprising trip-blocks upon said guide supports cooperating with means com- I prising levers supported by said guides to impart predetermined pivotal motion to said frame with each reciprocating movement of said off-take roll.

4. In a machine of the class described, in combination with a reciprocatin off-take roll for laying down a succession o overlapping folds of moist pulp web and a support for guidingand imparting reciprocating motion to said off-take roll, a device for smoothin and flattening the looped edges of said folds, said device comprising brackets mounted upon said support and reciprocating therewith, a frame pivotally suspended from said brackets, smoothing rolls mounted upon said frame, and means for moving said smoothing rolls into contact with opposite looped edgeportions of said folds on each successive reciprocating movement of said off-take roll.

5. In a machine of the character described,

' in combination-with a moving conveyor and a reciprocating looping device for laying down a succession of overlapping folds of moist pulp web upon said conveyor, a device for smoothing and flattening the looped edges of said folds, said device comprising rolls mounted upon said looping device and adapted to be lowered into contact with said folds, and means for lowering one of said rolls into contact with opposite looped edge portions of said folds on each successive re ciprocating movement of said looping device.

6. A machine for making fibrous sheets comprising in combination, means for forming moist pulp web, means for laying down said moist pulp web in a continuous succession of overlapping folds, means for smoothing and flattening individually the looped edge-portions of said folds, means for regularly spacin said individual folds in the machine directlon of the finished sheet, means for pressing said folds into a coherent sheet, means for drying said compressed sheet, means for side-trimming the edges of said dried sheet, and means for cutting said sheet into lengths.

7. A machine for making fibrous sheets comprising, in combination, means for forming a moist pulp web, means for treating said web with foreignsubstances, means for laying down said moist web in a continuous succession of overlapping folds, means for smoothing the looped edges .of said folds, means for regularly spacing said individual folds in the machine direction of the finished sheet, means for compressing said folds of moist web into a coherent sheet, means for drying said compressed sheet andmeans for cutting said sheet into lengths.

8. In a machine for making a water-resistant sheet, the combination of means for treating a moist pulp web with a water-resistant material, means for laying down said treated web in a continuous series of overlapping folds, means for smoothing and flattening the looped edges of said folds and means for pressing and rying said folds to form a dry, coherent, water-resistant, fibrous sheet.

9. In a machine of the'character described, in combination with a moving conveyor and a reciprocating looping devlce for laying down a succession of overlapping folds of moist pulp web upon said conveyor, of means for smoothing and flattening individually J the loo ed edges of said folds.

10. n a machine for making thick fibrous sheets, the combination of means for laying down a series of overlapping folds of moist pulp web on a conve or and means for smoothing and flattening the looped edges of said folds.

11. In amachine of the characterdescribed, means for smoothing andflattening the looped edges of the overlapping folds of moist pulp web as said folds are laid on a moving conveyor.

12. The method of making a fibrous sheet which comprises layin down a continuous series of overlap ing f0 ds of moist ulp web, smoothing and attening the looped edges of said folds and pressing said moist webs into a coherent sheet.

13. The method of making a fibrous sheet which comprises laying downa moist pulp web transversely upon a moving conveyor to form overlapping folds of moist pulp web, smoothing and flattening the looped edges of said folds and pressing said overlapping folds into a coherent sheet.

14. The step in the method of making a fibrous sheet by laying down a plurality of overlapping folds of moist pulp web on a moving conveyor which comprises smoothing and flattening the looped edges of said folds as each successive fold is laid on said conveyor,

In testimony whereof I affix my signature.

- MAX H. KLIEFOTH. 

